メモリのアクセス違反 - Vcl::Forms::TCustomForm::UpdateActions

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
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WinSCP 5.9.4

Error message:
メモリのアクセス違反

スタック トレース:
(0020E35E) Vcl::Forms::_16777
(0003EE3E) ntdll.dll.ZwWow64CallFunction64
(0003F5BA) ntdll.dll.KiUserExceptionDispatcher
(0020E396) Vcl::Forms::_16777
(0020E414) Vcl::Forms::TCustomForm::UpdateActions

The problem happens rarely. I cannot reproduce it.